Dividend aligning mechanism



13 Sheets-Sheet 1 INVENTORS Amman B. MACHADO fiwm J. Paps-mu- Sept. 29, 1953 A. a. MACHADO EIAL DIVIDEND ALIGNING MECHANISM Filed Dec. 22, 1948 P 1953 A. B. MACHADO ETAL 2,653,765

DIVIDEND ALIGNING MECHANISM Filed Dec. 22, 1948 13 Sheets-Sheet 2 mmrroks Ava-now hMAcuAoo B funk J-PRUELLAGE Sept. 29, 1953 A. B. MACHADO ETAL DIVIDEND ALIGNING MECHANISM l5 Sheets-Sheet 3 Filed Dec. 22, 1948 N n ANTHONY B. MAcHAoo f'RANK J. Faun-um:-

INVENTORS Sept. 29, 1953 A. B. MACHADO ETAL DIVIDEND ALIGNING MECHANISM 13 Sheets-Sheet 4 Filed Dec. 22. 1948 WHO . own

IN VEN TORS .r MG C u M 50 v NJ mK TN m A Y B Sept. 29, 1953 A. B. MACHADO ET AL DIVIDEND ALIGNING MECHANISM 1'6 Sheets-Sheet 5 Filed D60. 22, 1948 m mmuwmn 1NVNTOR3 Autumn BJMcuno B fiwm J Plumme- Sept. 29, 1953 A. B. MACH'ADO ET AL 2,653,765

DIVIDEND ALIGNING MECHANISM Filed Dec. 22. 1948 5 Sheets-Sheet 6 I76 I77 l75 FJI[E E v INVENTORJ ANTHONY B. MACHADO FRAN J. Plum:-

P 9, 1953 A. B. MACHADO ETAL 2,653,765

DIVIDEND ALIGNING MECHANISM Filed Dec. 22, 1948 13 Sheets-Sheet 7 I N VEN TORS BY FRANK J. PRUELLAGE- Annex? B. MACHADO A. B. MACHADO ET AL 2,653,765

DIVIDEND ALIGNING MECHANISM Sept. 29, 1953 Filed Dec. 22, 1948 13 Sheets-Sheet 8 INVENTORS Aurnouv B.MMHADO FRANK J PnueLLAez- B 000 OQM m0 Ev 00? 6M Mom 0 16* 00v 00 Q3 oklq I NON v om DON

Sept. 29, 1953 A. B. MACHADO ET AL 2,653,765

DIVIDEND ALIGNING MECHANISM Filed Dec. 22, 1948 13 Sheets-Sheet 9 vON v now i 3. 6,9,, mm aw Sept. 29, 1953 A. B. MACHADO ETAL DIVIDEND ALIGNING MECHANISM 15 Sheets-Sheet 10 Filed Dec. 22, 1948 P 1953 A. B. MACHADO ETAL 2,653,765

DIVIDEND ALIGNING MECHANISM Filed Dec. 22, 1948 125 Sheets-Sheet 11 IN VEN TORJ AN HONY B. MACHADO FRANK J. PRUHLAGE- Sept. 29, 1953 A. B. MACHADO ETAL 5 3 DIVIDEND ALIGNING MECHANISM Filed Dec. 22, 1948 15 Sheets-Sheet l2 BY FRANK J. PRUELLAQE +0 mam wrmwwrwrwrm w W w n v U EFIQH Poo Fling??? Sept. 29, 1953 A. B. MACHADO ETAL DIVIDEND ALIGNING MECHANISM 13 Sheets-Sheet 13 Filed Dec. 22, 1948 INVENTORS Au'rnouY hMncnAuo fmm J. Huang:-

Patented Sept. 29, 1953 UNITED STATES FTENT OFFICE J. Pruellage, Oakland, Calif.,

assignors to Fridezi Calculating Machine Co., Inc., a corporation of California Application December 22, 1948, Serial No. 66,688

27 Claims. 1

This invention relates to an improved automatic division mechanism for calculating machines and more particularly to a device for causing thefactors of a division problem to be automatically aligned with one another prior to the commencement of the actual dividing operation.

Many of the calculating machines on the market today are provided with a mechanism which serves to control the functioning of the machine in division problems in such a manner as to cause the dividend to be automatically divided by the divisor, the quotient being displayed on a set of figure dials at the conclusion of the operation. With these machines, however, it is first necessary for the operator to check the ordinal setting of the divisor and dividend before division is started in order to insure that the highest digits of the factors are in proper alignment with one another. in their correct positions, he must then manually control the shift mechanism so as to cause the factors to be brought into correct alignment after which the division key is depressed so as to initiate the division operation.

The present invention has to do with a mech-' anism for causing the dividend and divisor to be brought into proper alignment prior to the outset of the division operation thereby relieving the operator of the necessity of insuring that the alignment is correct before initiating the division operation. In accordance with this invention, th factors are set into the machine in the customary manner after which the division key is depressed. The novel mechanism hereinafter to be described, is thereby set into operation so as to cause the factors, if misaligned, to be brought into proper alignment after which the conventional automatic division mechanism will take over control and cause the machine to proceed with th division operation.

Accordingly, it is an object of the present invention to provide means for increasing the ease and rapidity with which division operations may be performed. This is accomplished by providing mechanism for automatically lining up the dividend and divisor at the outset of the operation whereby the time and effort spent by the operator in manually performing this step of the operation is eliminated.

Another object of the invention is to provide means for automatically aligning the dividend and divisor and then dividing the dividend by the divisor in one continuous operation.

A further object of the invention is to provide If they are not means for shifting th dividend relative to the divisor in one direction until the factors are brought into proper alignment after which the direction of shift is reversed and an automatic division operation is performed in the customary manner.

Still a further object of the invention is to provide a calculating machine having a shift reversing mechanism for the accumulator carriage which is controlled by the tens-transfer mechanism of the accumulator and also by the numerical setting of the accumulator wheels.

An additional object of the invention is to provide a calculating machine having means for shifting the accumulator carriage in one direction until the dividend is brought into alignment with the divisor or until the carriage reaches its end position after which the shift is automatically reversed so as to cause a normal dividing operation to take place.

The present invention is concerned with these and other objects which will become apparent from the following description of a preferred embodiment of the invention as shown in the accompanying drawings in which:

Fig. l is a perspective view of the complete machine.

Fig. 2 is a longitudinal sectional elevation illustrating the detailed construction of the accumulator carriage and of the selecting and actuating mechanism of the machine.

Fig. 3 is a view showing the mechanism mounted on the right-hand sid of the right side frame, this view being taken along the line 3 3 in Fig. 1.

Fig. 4 is a view similar to Fig. 3 but showing the mechanism mounted on the left-hand of the right-side frame, this view being taken along the line 4-4 in Fig. 1.

Fig. 5 is a side elevation taken along the line 55 in Fig. 1 showing the mechanism mounted on the left-hand sid of the control plate.

Fig. 6 is a plan view of the right-hand portion of the machine showing a part of the carriage shift mechanism.

Fig. 7 is a rear view of the machine showing a portion of the division aligner mechanism and also certain parts of the carriage shift mechanism.

Fig. 8 is a plan view of the rear portion of the machine showing certain parts of the division aligner mechanism.

Fig. 9 is a longitudinal sectional elevation taken along the line 99 in Fig. 8 and showing portion of the mechanism for terminating the carthe division aligner mechanism as viewed from.

the left-hand side of the machine.

Fig. 13 is a plan view showing the mechanism for sensing the numerical settingrof; the accumulator wheels.

Fig. 14 is a cross-sectional view taken along the line i i-4i in Fig. 8 showing. the mechanism for reversing the direction of the carriage shift when the carriage reaches its right-end position.

General description The present. invention is an improvement on a calculating machine: of the type disclosedin U. S. Patent No. 2,327,981, issued. to Carl F. Friden on August 31, 1943,, which. relates .toan improved automatic division mechanism for the calculating machine shown and described. in U. S. Patent No. 2,229,889, issued to Carl M. F. Friden on January 28, 1941.

Referring to Fig. l, the calculating machine incorporating the present invention includes a main body portion 20 containing the actuating, selecting and control mechanisms of the machine and an accumulator andrevolutionscounter carriage 2! which is mounted for endwise shifting movement transversely of the body portion 25. The carriage 2! has mounted thereina series of accumulator dials 22 and also a group of revolutions counter dials 23 which. are viewable through suitable openings provided in the'cover ZE-of the carriage. The carriage: may be shiftedby D in either direction across. the machine by manipulation of a left shiftv key 27 andaright shift key 2&3. located on the" right-hand side of. the. machine.

Numerical values. may be; entered in themachine by depression of appropriate numeral keys.

29 of a conventional amount. keyboard, the-keys in each row being releasable individually 'byde. pression of. an ordinal clear key 35 situated at the forward end of each bank of keys,v or the simultaneous release of all of thekeys may be accomplished by depression of a clear key 31. The-various values set up on. the keyboard may be registered additively or subtractively on the accumulator Wheels 22 by the depression of a plus key 32 or a minus key 33, respectively. If it isde sired that the keyboard. bewcleared after each registration of a munbcr in the accumulator, an add key 34 may be depressed and latched. down in the well-known manner.

The accumulator wheels 22 and the revolutions counter wheels 23 may be clearedor reset. to zero by manipulation of manually operable reset knobs 35 and. 35 respectively, these knobs being mounted for lateral sliding movement in the framework of the carriage. Alternatively, the wheels 22 and 23 may be zeroized by power through the depression of a return clear key 31.

The machine is adapted to perform automatic division operations by manipulation of a pair of division keys 38 and 39 which control a division mechanism similar to the type described in U. S. Patent No. 2,327,981 mentioned above. Automatic multiplication operations may be performed by depression of appropriate multiplier selection keys in order to set-up the desired multiplier factor on multiplier dials 5| viewable through a window 42 provided in the front cover of the machine. The multiplication operation is adapted to be initiated by one of the multiplication control keys 43, 54, or 45which will cause thecarriage 2i to'be shifted to its extreme lefthand position after which the multiplicand setup on the amount keys 29 will be multiplied digit by digit. by the multiplier set up on the dials 4|. If it should become necessary to clear the multiplier factor from the machine, a multiplier correction. key may be depressed which will initiate amachine operation in which the multip'lier' set-up mechanism will be normalized.

The machine is also provided with a group of ordinally arranged tabulator keys 50 and a dividend entry key 5! for effecting the entry of a dividend set up on the amount keys 29 into the accumulator wheels 22 in any selected. ordinal position. of the carriage. This. mechanism. isv fully shown and described in U. S. Patent. No. 2,403,273, issued to Carl M. Fridenet al. on July 2, 1946, and reference ismadeto this patent for. a detailedexplanation of the dividend entry mechanism.

Selecting and actuating mechanism The main operating mechanisms of the machine are supported for the most part on or between a right side frame 52 (Figs. 3, 4, 7 and 8) and a left side frame 53 (Figs. 7 and 8) which frames are secured to a base (not shown) which also serves to support the electric driving motor of the machine. The right and left side frames are interconnected by means of various crossframe members including crossbars 55, 55, 58 and 57 which are shown in cross-section. on Fig. 2.

The-values. tobe entered. into the accumulator numeralwheels 22 may be determined. by means of a plurality ofsimilar. selecting mechanisms associated. with the amount .keys. 29. As shown inxFig. 2, each. bank of. amount keys cooperates with a pair of similarvalueselecting slides 52. which. are mounted .for endwise movement by means of a. suitable supporting linkage includ-- ing links 59 and extending through suitable slots provided therefor in. the forward crossbar 55.

Each selecting slide58 is connected at its rear end. with. a ten tooth selection gear 60 slidably and nonrotatably mounted on a longitudinally extending square. shaft 6! journalled in the crossbars 54, 55 and 55. Hence, the longitudinal movement of the slidesv 58 as differentially controlled by the numeral keys 29 serves to position the selecting'gears 6B in the path of a series of stepped teeth provided on an actuating cylinder 55 secured to a shaft 66 journalled between the crossbar 55 and a transverse supporting bar 51. For each adjacent pairof key banks there is provided one longitudinally extending actuator shaft 66 bearing a pair of actuating cylinders 55. Each actuator shaft is provided at its forward end with a bevel gear 68 which meshes with a corresponding bevel gear 69' secured to a transverse power shaft 55 journalled between the side frames of the machine. The shaft 15 is cyclically and uni-directionally operated by means of a clutch controlled driving means, hereinafter to be described, so as to provide a single path of power flow from the electric driving motor to the various power operated mechanisms of the machine.

Each of the square shafts 6c is provided on its rear end with a slidably but non-rotatably mounted spool H to which is secured a ten-tooth add gear 12 and a ten-tooth subtract gear 13, which gears are adapted to cooperate with similar ten-tooth gears l4 secured on the lower ends of accumulator numeral wheel shafts l5.

When the machine is in its idle or full cycle position, the gears M lie midway between the add and subtract gears 12 and 13 so as to permit lateral shifting movement of the carriage. The gears 14, in this case, are free to pass through the space existing between the gears 12 and 13.

In order to enable an amount set up on the keys 29 to be added into the accumulator wheels 22, the spools H and gears '52 and is may be shifted toward the rear of the machine so as to engage the add gears 12 with the gears M. This shifting of the gears is accomplished by means of a flat bar or gate iii extending transversely of the machine and lying within the space provided between the add-subtract gears 12, 13. The gate '33 is supported at either end by a pair of similar arms i! secured to a transverse gate shaft '33 journalled between the side frames 52 and =53. The shaft it may be rocked clockwise as viewed in Fig. 2 in a manner hereinafter to be described so as to cause engagement of the add gears 72 with the gears i l or alternatively, the shaft 18 may be rocked counter-clockwise so as to result in engagement of the subtract gears 13 with the gears 74.

Tens-transfer mechanism Secured to the lower end of each of the numeral wheel shafts T5 is a tens-transfer cam 82 which is adapted to cooperate with a ransfer lever 8! bearing a stud $32 which is jour" nalled in the main frame bar 23 of the carriage. On the outer end of the transfer lever 85 there is provided a down-turned car 8 which lies bee tween a pair of flanges provided on the hub 85 of a tens-transfer gear 85-; located in the next higher order of the machine. The hub 85 and gear 85 are slidably, but non-rotatably mounted on the square shaft 6! whereby rotation of the gear will be transmitted through the addsubtract gears E2, E3 to the numeral wheel shaft l5. Whenever the accumulator wheel 22 passes from O to 9 or from 9 to a nose on the transfer cam Ell will rock the transfer lever GI and move the ear 8 forwardly so as to move the transfer gear 85 into the path of a single, transfer actuating tooth 81 formed on a disc 88 secured to the shaft The single tooth 61 will thereby cause one step of movement to be given to the square shaft iii in addition to the normal movement imparted thereto by the actuating cylinder 65. The accumulator wheel 22 will thus be advanced one step so as to effect the carry from one order to the next higher order as required.

After the tens-transfer has been elfected, the transfer gear 8'5 will be restored to its normal position by means of a restoring cam 9i} secured to the actuator shaft This restoring cam operates on the forward end of a detent pin 9! which is mounted for sliding movement in the crossbar and in a transverse supporting bar 92. The pin 84 carries a pair of spaced flanges 93 which embrace one of the flanges provided on the hub 85 of the transfer gear 86 so that when the pin is carnmed rearwardly, the gear 88 will be restored to its normal position.

Revolutions counter As shown in Fig. 2, each of the revolution counter numeral wheels 23 is secured to a longitudinall extending shaft 93 iournalled at its rear end in the frame bar 533 and at its forward end in a channel bar 99 which forms a part or the framework of the carriage 2i. Secured to each of the shafts as is a gear lilo which is arranged to cooperate with a revolutions counter actuating mechanism it]! for operating the numeral wheels 23 in such a manner as to provide a count of the cyclic operations of the calculating machine and also for causing a unit to be transferred from a lower order to a higher order each time a wheel 23 passes through zero.

The revolutions counter mechanism is fully shown and described in the above-mentioned Patent 2,229,889, to which reference may be had for a more complete disclosure of this part of the machine.

Motor drive In order to effect regis ration in the accumulator of the value set up on the amount keys 25, the actuator shafts {it are operated in a cyclic fashion by means of a clutch controlled drive from the electric motor of the machine. As shown in Fig. 3, the armature shaft oi the motor has secured thereto a pinion N35 which meshes with an idler gear It? which in turn meshes with a large gear I28 journalled on the transverse power shaft iii. The gear is provided with a hub to which is secured a driving clutch element or ratchet (not shown). A driven clutch element 189 is secured to the shaft 15 and has pivoted thereon a spring-urged. clutch pawl i IE which is provided with a tooth which is adapted to engage with the teeth of the ratchet for establishing a driving connection between the gear 588 and the power shaft 3'51. The pawl. H3 is norm-ally spring-urged into drive-engaging relationship with the ratchet, but is restrained in the open or full cycle position by means of a clutch control lever ll! pivotally mounted on a screw H2 fastened to the right side frame The lever IH carries a pivoted roller 5 S which seats in a depression formed on the driven clutch element I69 in the full cycle position thereof and in all other positions of the element are maintains the lever ii! in its clutch-engaging position. It will be seen therefore that one or more cycles of the actuator shafts may be determined by proper control of the lever i l i.

Simultaneous with the movement of the lever III in a clockwise direction, as viewed in Fig. 3, so as to cause engagement of the clutch, the electric circuit for the driving motor will be established. For this purpose a stud H4 in the upper end of the lever is connected by means of a link I IS with the upper end or a lever H6 pivotally mounted on a screw li'l secured to the right side frame. The lower end of the lever I It is provided with a bifurcation which engages with a pin H8 provided on the upper end of a lever H9 pivotally mounted on a screw I29 secured to the right side frame 52. On its lower end the lever H9 is provided with a suitably insulated pin I2! which lies against one leaf of a leaf spring contact I22. Thus, clockwise movement of the clutch control lever i I i will cause counterclockwise movement of the lever llE-i so as to cause the pin I21 to force the contacts I22 into engagement and thereby close the electric circuit for the motor. It will be observed that the roller H3 in maintaining the control lever Ill in its clutch-engaging position throughout the machine cycle will also serve to maintain the contacts I22 closed so that the motor circuit can be interrupted only in the full cycle position of the parts.

Plus and minus keys Referring to Fig. of the drawings it will be observed that the plus key 32 and the minus key 33 are both slidably mounted on a control plate In mounted on the right-hand side of the right side frame 52 by means of suitable screws and spacing sleeves. The keys 32 and 33 are provided with roller studs I28 and I29, respectively, which cooperate with inclined cam faces I30 and I3I respectively, provided on a gate setting slide I32. This slide is pivotally connected at either end to the upper ends of arms I33 and I36 (Figs. 5 and the arm I33 being pivoted on the control plate I2'I while the arm I36 is secured to the right-hand end of the gate shaft I8. Hence, when the plus key 32 is depressed, the slide I32 will be moved rearwardly so as to rotate the gate shaft in a clockwise direction, as viewed in Fig. 2, thereby causing the add gears I2 to be engaged with the gears It on the numeral wheel shafts I5. In a similar manner, depression of the minus key 33 will cause forward movement of the slide I32 thereby rocking the gate shaft I6 counter-clockwise so as to engage the subtract gears I3 with the gears 74.

In order to initiate operation of the drive mechanism of the machine when either key 32 or 33 is depressed, each of these keys is provided with a half-round stud I3'I which is adapted to cooperate with a cam face I38 provided on a cycle-initiating slide I39. The rear end of this slide bears against the stud I I4 so that when either of the keys are depressed, the stud will be moved rearwardly thereby rocking the clutch control lever III (Fig. 3) clockwise so as to engage the clutch and close the contacts I22. This will cause the electric driving motor of the machine to be energized and the power shaft III to be rotated thereby driving the actuator shafts 66 A to which are secured the actuating cylinders 55. Hence, the amount set on the keys 29 will be run into the accumulator wheels 22 in either a positive or negative direction depending on which of the keys 32 or 33 is depressed.

Carriage shzjt' mechanism Means are provided for shifting the carriage selectively in either direction through one or more ordinal spaces and the shifting'means is pref- I erably operated from the actuator shafts 66 under the control of the manually depressible shift keys 2? and 28. These keys are mounted for vertical sliding movement on the right side frame 52 by suitable pin and slot connections, the keys being normally maintained in their raised position by means of suitable springs.

As fully shown and described in U. S. Patent No. 2,380,642, issued to Carl M. Friden et al. on July 31, 1945, the shift keys carry studs which cooperate with a pair of arms I45 and I46 (Fig. 6) and cause the arms to be rocked when the keys are depressed. As will later be described, rocking of these arms will cause either the left shift clutch or the right shift clutch to be engaged and thereby determine shifting of the carriage in one direction or the other. As disclosed in the patent, suitable connections are also provided between the keys and the lever I I6 (Fig. 3) which will cause this lever tobe rocked clock- S wise upon depression of either of the keys 2'! or 28 and thereby initiate cyclic operation of the actuator shafts 66 so as to provide the power drive for the shift mechanism.

Referring again to Fig. 6, it will be observed that the arm I is pinned to a transverse shaft I I'I which is journalled between the right side frame 52 and a bracket I48 secured to the crossbar 5d. .Also pinned to the shaft I i? is an arm I 49 to which is pivotally connected a pusher link I 50 which is notched at its rear end so as to engage with the forward end of a left shift push rod I5I which is mounted for longitudinal sliding movement in the machine. The rear end of the link I56 is normally urged downwardly so as to engage the notch in the link with the forward end of the rod I5I by means of a spring I52.

In a like manner, the arm M56 is secured to the right-hand end of a sleeve I53 to the lefthand end of which is secured an arm I52 similar to the previously mentioned arm M9. Pivotally connected to the arm Its is a pusher link I55 which, like the link I56, is notched at its rearward end so as to engage with the forward end of a right shift push rod I56 which is slidably mounted within the framework of the machine. The notch in the pusher link I55 is normally maintained in engagement with the forward end of the pusher link I56 by means of a spring I5I. The push rods I5I and I56 are normally maintained in their forward or inactive positions as shown in Fig. 6 by means of compression springs I52 and I59, while the rear ends of the rods carry shifting forks I 56 and I6! which engage with annular grooves cut in clutch members I52 and I63. The members I62, I63 are loosely journalled on the rear ends of the two right-most actuator shafts 66 and are provided with clutch teeth I5 3 and I 65 which engage with corresponding notches provided in collars secured to the rear ends of the actuator shafts The members I62 and I63 are also provided on their rear ends with clutch teeth which are adapted to cooperate with clutch teeth I66 and Ilil' formed on the forward ends of gear sleeves I68 and I69 when either the member I52 or the member IE3 is moved rearwardly by its associated shift fork I66 or I6i. Hence, it will be seen that the coupling members I62 and I63 provide a means whereby the actuator shafts 66 may be seleotively coupled to the gear sleeves I66 or IE9 and thereby provide a power drive for the carriage shift mechanism. Hence, upon depression of the left shift key 2? the arm I 55 will be rocked and the pusher link I56 moved rearwardly so as to move the push rod I5I and the shift fork I59 toward the rear of the machine and thereby cause the coupling member I62 to establish a driving connection from the actuator shaft 55 to the gear sleeve I68. In a similar manner, when the right shift key 28 is depressed, the arm will be rocked and the pusher link I 55 moved rearwardly so as to operate the push rod I55 and shift fork ItI and establish a driving connection between the rightmost actuator shaft 66 and the gear sleeve I69.

As seen in Fig. 6, the gear sleeve IE5 carries a ear I76 which meshes directly with a larger gear I'i'I to which is secured a smaller gear (not shown) which meshes with a shift gear H2. The gear sleeve I69 carries a gear I'I3 which meshes with a wide idler gear (not shown) which meshes with the large gear III and causes reverse rotation of this gear. The gear sizes are so chosen as to provide a drive ratio of 1 to 4 between the gears I and I73 and the shift gear H2 so that for each rotation of the gear sleeve I68 or I89, the shift gear I'I2 will be rotated through an angle of 90 degrees.

The shift gear H2 is secured to a. shaft which is journalled. between the crossbar t5 and a plate I mounted on the rear of the machine. Secured to the same shaft as the gear i'i2 is a drive plate iii which carries four equally spaced drive pins I78 which are adapted to engage with notches I18 (Fig. '7) provided in a shift rack I80 secured on the rear of the carriage 2!. Hence, for each 90 degrees of rotation of the drive plate I'l'I the carriage will be shifted through a distance equal to the spacing between the notches H9 which is equal to the distance between the numeral wheel shafts 75 (Fig. 2). In other words, the carriage will be shifted one ordinal space on each cycle of operation of the power shaft i0.

Means are provided for disabling the control of the shift keys 21 and 28 whenever the carriage reaches either of its extreme end positions. For this purpose means are provided for lifting the pusher li'nlas I50 and IE5 against the force of the springs I52 and I51 when the carriage reaches either its left end or its right end position. The lifting of the pusher link IE0 is accomplished by means of an arm I85 (Figs. 6 and 8) secured to a transverse shaft 88 which is journalled at either end in brackets I8? and I88 secured to the rear face of the crossbar 5%. Fast on the right-hand end of the shaft 86 is a downwardly extending arm I89 (Fig. 9) to the lower end of which is pivotally connected the forward end of a link We which, as shown in Figs. '7 and 9, is pivotally connected at its rear end to one arm lei of a bellcrank lever I92 which is journalled on the gate shaft "l8. As shown in Fig. 9, this bellcrank lever has a rearwardly extending arm which lies beneath the right-hand end of a lever I533 which is pivotally mounted on a screw ISd (Fig. 7) fastened to the crossbar 56. The lever I93 corresponds to the lever 208 shown in Fig. 8 of Patent No. 2. 103273 hereinbefore referred to, and like the lever 208, is arranged to lie beneath an override pawl corresponding to pawl 226 shown in the patent. When the carriage 2I reaches its left end position, the shift pins will rock the override pawl and cause the lever I93 to be depressed against the tension of a spring L95 which normally maintains this lever in its raised position. The bellcrank lever I92 (see Fig. 9) will thereupon be rocked counter-clockwise and cause the shaft I86 to be rocked in the same direction. The forward end of the lifter arm I85 (Figs. 6 and 8) which is secured to the shaft I85 will thereby be raised so as to disengage the notch formed in the rear end of the pusher link I50 from the forward end of the push rod I5I thereby permitting this rod to be moved forwardly to its inactive position by the compression spring I58. Hence, the left shift clutch will be disengaged and the left shift operation will be terminated.

In a similar manner the pusher link I55 for the right shift control mechanism is adapted to be disengaged from the push rod I56 by means of a lifter arm I99 (Figs. 6 and 8) which is loosely journalled on the shaft I86. As shown in Fig. 9, the lifter arm I99 has integrally formed therewith a rearwardly extending arm 200 which is provided with a slot which embraces a pin I riveted on the forwardly extending arm of a lever 202 loosely journalled on the gate shaft I8. The

lever 202 has a rearwardly extending arm which carries a roll 203 which, as shown in Fig. 7, lies above one end of a lever 204 which is pivoted at 205 on the lower end of a lever 206 pivoted at 28? on a plate 208 which is secured to the rear face of the crossbar 56 by means of suitable spacer sleeves and screws. The lever 2% has an upwardly extending arm which is provided with a formed-over ear 209 lying beneath an override pawl 2I0 which is pivotally mounted at 2H on the shift rack I80. This pawl is normally maintained in the position shown in Fig. 7 by means of a spring 2I2 which causes a shoulder formed on the pawl to be held against a stud 2I3 on the shift rack IBQ. When the carriage reaches its right end position, the shift pins H5 will engage with a cam surface 2M formed on the pawl 2H: and cause the pawl to be rocked clockwise as viewed in Fig. '7 against the urgency of the spring 2l2. The lever 206 will thereby be rocked counter-clockwise against the urgency of a spring 2 i5 and so cause the lever 204 to be moved toward the right as viewed in Fig. 7. The lever 234. is provided with a cam face ZIB which lies beneath a roll 2 I1 mounted on the plate 238. Hence, when the lever 204 is moved toward the right as viewed in Fig. 7, it will be rocked clockwise thereby elevating the rear end of the lever 202 so as to cause the lifter arm I99 to be raised and the pusher link I55 to be disengaged from the push rod I56. This will effectively disable the control exercised by the right shift key 2% over the right shift clutch and permit the compression spring I59 mounted on the forward end of the push rod I58 to disengage the clutch and thereby terminate the right shift operation.

The foregoing description of the carriage shift mechanism is believed sufficient for a clear understanding of the present invention and reference is made to Patent No. 2,380,642 for a more detailed disclosure of this part of the machine.

Automatic division mechanism As mentioned earlier herein, the machine shown in the accompanying drawings is provided with a mechanism for enabling a dividend set up on the accumulator wheels 22 to be automatically divided by a divisor set up on the amount keys 29. The mechanism provided in the present machine for accomplishing this purpose is similar to that shown in Patent No. 2,327,981 hereinbefore referred to and accordingly, only so much of the automatic division mechanism will be described herein as is necessary for a clear understanding of the present invention.

The automatic division mechanism operates to control the functioning of the machine so as to cause the divisor to be repeatedly subtracted from the dividend until an overdraft occurs in the accumulator, whereupon the overdraft will be corrected and the carriage shifted one ordinal space to the left whereupon the process will be repeated. The number of subtraction cycles effected in each order of the accumulator is registered in the revolutions counter so as to provide a visual representation of the quotient at the end of the prob lem. During division the machine is controlled by a program control device which becomes effective each time an overdraft occurs in the accumulator to program the operation of the add subtract gears and the carriage shift mechanism so as to cause a predetermined sequence of op erations to occur during uninterrupted cyclic operation of the actuating mechanism of the machine. The division operation is initiated by the geesies depression of a division key which causes the program control device to be operatively connected with the add-subtract gate and also with the carriage shift mechanism and, in addition, renders the overdraft control mechanism effective to control the cycling of the programming de vice.

As shown in Fig. 5, a division key 38 is slidably mounted on the control plate I21 by means of slots in the key stem which cooperate with screws secured to the control plate so as to guide the key for vertical reciprocatory movement. The key is normally urged to its raised position by means of a suitable spring 221 and is provided at its lower end with an inclined cam face 222 which bears against a roll 223 mounted on a division slide 224. This slide is supported for endwise shifting movement on the control plate I21 by means of elongated slots in the slide which cooperate with studs 225 secured to thecontrol plate. As shown in Fig. 10, the slide 224 is provided with a roll 226 which lies in front of a finger 227 formed on the upper end of a latch 228 pivotally mounted at 229 on the control plate I27. The latch 228 is urged to rotate in a counterclockwise direction by means of a spring 236 tensioned between the lower end of the latch and a stud 23% mounted on the control plate so as to normally maintain a shoulder 232 formed on the latch beneath a stud 233 secured to the forward 9 end of a division setting actuator 234. The actuator 23s is pivotally mounted on the control plate at 235 and is urged to rotate in a counterclockwise direction by means of a strong spring 235 which is tensioned between the actuator and the stud 23 I. The stud 233 is thereby maintained in engagement with the shoulder 232 of the latch when the parts are in their normal positions. However, when the division key 38 (Fig. is depressed, the cam face 222 will engage with the roll 223 thereby moving the slide 224 rearwardly so as to cause the roll 226 to engage with the finer 227 and rock the latch 228 clockwise so as to remove the shoulder 232 from beneath the stud 233 of the actuator 234. The actuator will thereupon be rocked counter-clockwise by the strong spring 23% so as to cause setting of the division control mechanism hereinafter to be described. The actuator 236 will be restored durin cycling of the machine by means of a roll 23? mounted on the face of a gear 238 secured to the right-hand end of the power shaft 29. ihe roll 231 is adapted to engage an inclined cam face 239 formed on an upwardly extending arm of the actuator 234 so as to cause the actuator to be rocked clockwise against the tension of the spring 236 when the machine is cycled.

Lying beneath the forward end of the actuator 23 is a roll 2% (see also Fig. 5)' which is mounted on the lower end of a link 24! which is pivotally connected at 242 to the forward end of a connecting lever 253. This lever is pivotally mounted on a stud 2% carried by a cam follower arm 2% which is pivotally mounted on the control plate 52? at 245 and urged in a clockwise direction, as viewed in Fig. 5, by means of a spring 24?. The arm 2 is provided with an aperture within which is located an eccentric cam 252 mounted on a program control shaft 25!. As described in the aforementioned Patent No. 2,327,- 981, this shaft forms an essential part of the program controlling device and is rotated during division operations to control the setting of the add-subtract gate and the operation of the carriage shift mechanism. These operations are performed in a predetermined sequence so as to cause the machine to carry out a division operation during continuous cycling of the machine.

The lever 223 is provided on its rear end with a bifurcation 252 for engaging with a stud 253 secured to the gate setting slide I32. Thus, when the division key 38 is depressed so as to release the actuator 234 (Fig. 10) the roll 24?: will be depressed and the connecting lever 243 will be rocked clockwise as viewed in 5 so as to cause an inclined face 25-; formed on the rear end of the lever 243 to engage with the stud 253 and cam the slide I32 forward so as to engage the subtract gears it with the gears is on the shafts i5 and thereafter cause the stud 253 to become eated in the bifurcation 252. The connecting lever 2 13 thereby serves as a connection between the follower arm 2&5 and the gate setting slide E22 so that movements of the arm 2% will be communicated to the slide for the purpose of controlling the add-subtract gears during division operations.

The connecting lever 2 33 is retained in its operated position throughout the division operation by means of a half-round stud 2S6 mounted in the rear end of the lever which is adapted to be engaged by a latch 26! (see Fig. 3) pivotally mounted on a stud 259 mounted on the right side frame 52. The latch 28! is urged into latching engagement with the stud 260 by means of a tension spring 262 so that when the lever 2 53 is rocked counter-clockwise, as viewed in Fig. 3, the latch will engage beneath the stud 260 and hold the connecting lever in its operated position until the latch is released at the end of the division operation.

In order to initiate cycling of the machine during division operations, the link 2 (Fig. 5) is pivotally connected at its upper end to the rear end of bellcrank lever 263 which is pivotally mounted on a screw 2% secured to the control plate I21. This bellcrank is provided with an upstanding arm 265 which lies in front of a stud 26% mounted on the cycle initiating slide 5 39. Hence, when the link 249 is depressed upon the release of the actuator 23% (Fig, 10), the bellcrank 263 will be rocked counter-clockwise against the urgency of a spring 28? thereby causing the slide 539 to be moved toward the rear of the machine so as to engage the clutch and close the motor contact through the means previously described in connection with the plus and minus keys.

Referring to Fig. 10 of the drawings, it will be observed that the program control shaft 25! extends through the control plate 52? and is provided on its right-hand end with a mutilated gear 219 which is adapted to be moved into and out of driving relationship with a larger mutilated gear 218 which is secured to a gear 272 journalled on a screw 2l3 mounted in the control plate. The gear 2'i2 in turn meshes with the gear 238 secured on the right-hand end of the power shaft is so that when the clutch is engaged and the shaft i0 rotated, the gear 228 will drive the gear 272 and the large mutilated gear 27!. The small mutilated gear 2% is normally located out of the plane of the gear 2H so that the program control shaft 25! is normally inoperative. As shown in Fig. 8, the shaft 25! is normally urged toward the left as viewed from the front of the machine by means of a spring 2775 on the shaft 25! which is compressed between a collar on the shaft and an arm 276 on a bracket 27? secured to the crossbar 6?. Hence, the gear 276 is urged to a position where it lies against the right-hand side of the control plate 527 with a notch formed in the periphery of the gear engaged over a pin 218 mounted in the control plate. By means hereinafter to be described, the shaft 25! and gear 219 are shifted to the right at certain times during a division operation so to move the gear into the plane of the large mutilated gear 2li so as to establish a driving connection to the shaft 25i from the transverse power shaft ill.

As seen in Fig. 10, the gear 2% has three equally spaced sets of three teeth each which are arranged to cooperate with a single set of three teeth provided on the gear fill. As the latter gear rotates in a counter-clockwise direction during cycling of the machine its two teeth are so positioned thereon as to engage with one of the sets of three teeth on the gear 219 just before the end of a machine cycle. Hence, when the small mutilated gear is projected into the path of the larger gear 2H during the course of a division operation, the gear 2% will be rotated clockwise through one-third of a revolution at the end of the instant cycle and also through onethird of a revolution at the end of each of the two next succeeding cycles, the gear and shaft 25! being maintained in their righthand positions by the engagement of the pin 218 with the left-hand face of the gear 2153.

Referring to Fig. 5, the lever bears a stud 28% which lies beneath a forward end of an arm secured to a laterally extending shaft 282 (Fig. 8) which is journalled between control plate 52? and the left side frame 53 of the machine. Also secured to the shaft 282 at the lefthand side of the machine is arm 233 (see also Figs, 11 and 3.2) which is provided at its forward end with a stud which engages in an elongated slot provided in the lower end of an overdraft control link 2835. This link is pivoted at its upper end on a stud 235 secured to a yoke 28? which is fastened on an extension 28 3 of the highest order tens-transfer detent pin 9!. As mentioned earlier herein, when a transfer is effected from one order of the accumulator to the next, the 5i will be moved forwardly as an incident to the forward movement of the transfer gear 255 for the purpose of placing this gear in the path of the transfer actuating tooth 8?. Hence, when a transfer occurs which effects a forward movement of the left-most detent pin 9!, the extension 283 thereof will cause the link 285 to be moved forward for a purpose to be hereinafter described.

As shown in Fig. 11, the forward end of the link 285 is normally held in its depressed or inactive position by a, spring 289, but upon depression of the division key and rocking of the connecting lever 253, the shaft 282 will be rocked clockwise as viewed in Fig. 11 thereby causing the pin 28 to lift the forward end of the link 235 so that it will lie directly behind a division control flag 299 which is pivotally mounted on the control shaft 25!. Hence, when the link 285 is moved forward as a result of the forward movement of the left-most detent pin 9|, the iiag will be rocked clockwise as viewed in Fig. 11 against the urgency of a spring 29! (see Fig. 8) so as to move an upwardly extending finger 292 on the flag into the plane of a pin 293 carried by a cylinder 295. which is mounted on the leftmost actuator shaft 65. Hence, as the shaft 65 rotates, the pin 293 will engage the finger 292 and displace the flag to the right as viewed in Fig. 8. Inasmuch as the flag is prevented from moving laterally on the shaft 25l by means of a collar 295 and a cam 296 which are pinned to the shaft 251, this shaft and the small mutilated gear 210 will likewise be displaced to the right so as to bring the gear into the plane of the larger gear 21!. Thus, the shaft 25! and the cam 250 (Fig. 5) will be given three steps of movement during the next three cycles of the machine, after which, the gear 210 will drop back over the pin 218 to its inactive position. In the meantime, the overdraft control link 285 will be moved rearwardly so as to release the flag 290 due to the restoration of the detent pin 9! by the restoring cam 90.

When the cam 253 (Fig. 5) occupies the position marked A, which is the position of the cam when the notch in the small mutilated gear 21!! engages with the pin 218, the connecting lever 243 will be so positioned as to hold the gate setting slide i152 in its forward position so as to cause the subtract gears 13 to engage with the gears 14 on the numeral wheel shafts 15. The machine will therefore be set for subtraction and the value of the divisor set up on the amount keys 29 will be subtracted from the accumulator wheels 22 each time the machine makes one cycle of operation. At the end of the cycle in which an overdraft occurs in the accumulator, the shaft 25| will be displaced toward the right under the control of the transfer mechanism as described above thereby causing the shaft to be rotated counterclockwise to the position marked B whereupon the cam 250 will rock the follower arm 245 counter-clockwise (Fig. 5) thereby moving the connecting lever 243 toward the rear of the machine so as to cause the add gears 12 to be moved into mesh with the gears 14. Therefore, during the following cycle of operation of the machine, the divisor will be added back into the accumulator so as to correct the overdraft and at the end of this cycle the program control shaft will be rotated through another degrees to the position marked 0 thereby moving the arm 245 to an intermediate position where the add-subtract gears 12, 13 will be held out of engagement with the gears i l preparatory to a carriage shifting operation. The arm 245 is arranged to be yieldably maintained in this intermediate position by means of a spring-urged centralizer arm 291 provided with a V-shaped nose which is adapted to engage in a corresponding notch provided in the upper edge of the arm 245.

In order to cause the carriage to be shifted one ordinal position to the left during the machine cycle following movement of the shaft 25! to position C, a cam 298 (Figs. 8 and 9) is secured to the shaft 25!, this cam being provided with a node 299. When the shaft 25! is moved toward the right by the action of the pin 293 on the flag 2%, the node 299 on the cam 298 is moved toward a follower arm Still which is so cured to a hub 3M (Fig. 8) pinned to a transverse shaft 302. This shaft is journalled at its righthand end in the right side frame 52 and at its left-hand end in the arm 2ft of the bracket 27? and is arranged to receive axial shifting movements as will subsequently be explained. The hub 30! is provided with a flange 363 which, together with the follower arm 3%, provides an annular groove for receiving a finger 3B4 provided on a bellcrank lever 395 (Fig. 9). This lever is pivotally mounted on a stud 306 mounted in a bracket 307 which is fastened to the right side frame 52. The bellcrank lever is provided with a forwardly directed arm 308 which 

